This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A167799 #7 Jan 04 2025 00:37:36 %S A167799 2,5,10,11,17,22,23,25,29,34,46,47,50,53,58,59,71,83,89,94,101,106, %T A167799 107,113,118,125,131,137,142,149,166,167,173,178,179,191,197,202,214, %U A167799 226,227,233,239,250,251,257,262,263,269,274,281,289,293,298,311,317,334 %N A167799 Numbers with primitive root -3. %H A167799 Vincenzo Librandi, <a href="/A167799/b167799.txt">Table of n, a(n) for n = 1..1000</a> %t A167799 pr=-3; Select[Range[2,2000], MultiplicativeOrder[pr,# ] == EulerPhi[ # ] &] %o A167799 (PARI) is(n)=if(n%3==0, return(0)); my(p=eulerphi(n)); znorder(Mod(-3, n), p)==p \\ _Charles R Greathouse IV_, Jan 04 2025 %Y A167799 Cf. A105875 (primes with primitive root -3) %K A167799 nonn %O A167799 1,1 %A A167799 _T. D. Noe_, Nov 12 2009